Modbus
register
Data type /
Size in bytes
Parameter Description Default value
[units]
(units register)
Value range /
Setting options
Access
level
10255 Unsigned / 2 Pulses per
amount
Number of pulses
which will be output
when configured
amount is reached.
1 - Read /
write
9474 Float / 4 Pulse width Pulse duration. 0.1
[s]
0.00004 - 4.0 Read /
write
9477 Unsigned / 2 Polarity Logical polarity of pulse
output.
0
● 0: Active high level
● 1: Active low level
Read /
write
9592 Unsigned / 2 Fail-safe activa‐
tion condition
Fail safe activation con‐
dition.
1
● 0: Bad status of
selected process
value
● 1: Active
Maintenance alarm
or Failure (NAMUR)
Read /
write
9481 Unsigned / 2 Fail-safe min.
time
Minimum time the out‐
put stays in Fail-safe
behavior.
0
[s]
0 - 100 Read /
write
9461 Unsigned / 2 Fail-safe behav‐
ior
Pulse output reaction in
case of a fault.
0
● 0: Last valid value
● 1: Hold. Value 0.0
substitutes the actual
input value
● 2: Disabled
● 3: Custom value
Read /
write
7441 Float / 4 Fail-safe value Output value in case of
a fault and when Fail-
safe behavior (9461) is
configured to 4.
0.0
[pulses/s]
0.0 - 12500.0 Read /
write
7165 Float / 4 Forced value Forced value when
forcing is active.
1.0
[pulses/s]
0.0 - 12500.0 Read /
write
Modbus communication
A.9 Modbus holding registers tables
SITRANS FST030 (Modbus)
Operating Instructions, 08/2018, A5E37367739-AD 255
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